1State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, P.R. China2Gemoc Arc National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Nsw 2109, Australia3Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P.R. China4Institute of Geology, Chinese Academy of Geological Sciences, Baiwanzhuang Road 26, Beijing 100037, P.R. China5Department of Geological and Environmental Sciences, Stanford University, CA 94305, USA